Contract 0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d

 

Contract Overview

USD Coin: USDC Token
Balance:
0 BNB

BNB Value:
$0.00

Token:
Txn Hash
Block
From
To
Value [Txn Fee]
0x2049f3b40cfb6e5d455697e7214c605d7dd1853d10482d9892d2ce127fdea8e825935992020-11-27 5:41:1441 secs ago0xb59a4715b00b62c9ed71b956578eaf88f2d47560 IN  USD Coin: USDC Token0 BNB0.0008717856
0xea5a2f05b746010451f594586787e9539e943daf36da2be44e0e4ea4d599e40925935382020-11-27 5:38:113 mins agoBinance: Hot Wallet IN  USD Coin: USDC Token0 BNB0.0010779
0xbde3cb050489487239a047478a166e31e517b20cb808714c63673e2df1ec838125934822020-11-27 5:35:236 mins ago0x24d18cd77d4e77a569d30b9fb146ef02d4939ab0 IN  USD Coin: USDC Token0 BNB0.00094304
0x6cd2e61714cfe181ff96648be4ae7213e5587ce02bfcf0f954d4af1fc958bcf125934662020-11-27 5:34:357 mins ago0xb59a4715b00b62c9ed71b956578eaf88f2d47560 IN  USD Coin: USDC Token0 BNB0.00085569
0xe424c4e59723f3d03c8ad3ea81249469e13d34921684efe697c46d5b315d15b725933892020-11-27 5:30:4411 mins ago0x2c7cad52321551666ffcdcf3b3feb19609171977 IN  USD Coin: USDC Token0 BNB0.00047814
0x5b4a0bfd0f1b381999834c993dcc77fbae574182fd15ce226c0861fb5748714525933862020-11-27 5:30:3511 mins ago0xbb1d423c4d0f7cff78d3016d61c9006bf3365ac0 IN  USD Coin: USDC Token0 BNB0.00047742
0xde03c8a6904b7806580b57252ca784b5eb96a7e9623c3893d2ac17310c3606b525933852020-11-27 5:30:3211 mins ago0xf67b6901a32c75ef61c2b25518d907232dfd63c5 IN  USD Coin: USDC Token0 BNB0.00047814
0xbf5d1bf4cac939372458c820a3428a60788cecc818fba545095086e3afcb6aea25933742020-11-27 5:29:5911 mins ago0x231d04d32ddc9573b775b1738b51f8108639017c IN  USD Coin: USDC Token0 BNB0.000817047
0xc4c70d44af69e1664f7afe2b6241930c0f99b0fea6fb64d1bc73e02e6f99b3d125933362020-11-27 5:28:0513 mins ago0xda4e42749cb44afa7222643ca0a3218d8df5ddb6 IN  USD Coin: USDC Token0 BNB0.0007820307
0x37f4de0437aa282d8e7650a715ac86b1e6ebf5f28b7c7a7a416e7576e3c2035025932762020-11-27 5:25:0516 mins ago0xef575087f1e7bec54046f98119c8c392a37c51dd IN  USD Coin: USDC Token0 BNB0.001508052
0x39c51f47d7aa400aa6e6e143492774e38e2282d8c8d5b6473e99aca92343877925932722020-11-27 5:24:5317 mins agoBinance: Hot Wallet IN  USD Coin: USDC Token0 BNB0.00077814
0x5708026f11d9e58b4389cd59cf3fc56576eec4ce5fe5f148815d4221afd26b1825931922020-11-27 5:20:5321 mins ago0x7ad222af87e6147929542973338427353f263ade IN  USD Coin: USDC Token0 BNB0.00094304
0x28df17d134bfade327fd6a1b8fadfa59144d5c0656f1209661ebd8b5a355372425931332020-11-27 5:17:5623 mins ago0x569375bad79a2ee07ccac7b91f44d9558c163b54 IN  USD Coin: USDC Token0 BNB0.00116721
0xff7c8e6c503c38651ba0a4f5e76fd791803a30a8588c486e850bb2d36a33041d25929862020-11-27 5:10:3531 mins agoBinance: Hot Wallet IN  USD Coin: USDC Token0 BNB0.00107766
0xdee8524801b3475958ab3906732a7c7ed4bf971064e942070ad45eee84637ad125927802020-11-27 5:00:1741 mins ago0x435e3a964ba07e366ff175a5983b0ba310cf649f IN  USD Coin: USDC Token0 BNB0.00047814
0xc6f9d433835577e758e6684439ab3edaa8456c5b36581fe1e5f83f35837d8e1825925702020-11-27 4:49:4752 mins ago0x2f96a643d7fd98d2664364454b3f74ace529b93a IN  USD Coin: USDC Token0 BNB0.0005902065
0x8eafc29648ca42254963cc42ba6c1e67a9b6432db637652a10aca73662ff673325925362020-11-27 4:48:0553 mins ago0x2df7ed4ee4b8b5d944ac85a8f651cd343aeadf0b IN  USD Coin: USDC Token0 BNB0.00107742
0x7cf5e3bca527efc8e92e7726093e33f29ac36124207c97f1daa29390c8f2383c25925262020-11-27 4:47:3554 mins ago0x2df7ed4ee4b8b5d944ac85a8f651cd343aeadf0b IN  USD Coin: USDC Token0 BNB0.00107742
0x11c42abda12e0d36852ac46746f9e6defcf20e248d75ad7d676a95b94392557f25924902020-11-27 4:45:4756 mins ago0x31c6dbe462e81275a601d75f4ea0151264c21ca4 IN  USD Coin: USDC Token0 BNB0.00094304
0x4a33ebb11ed20e1505d1a8de1d51d587a82edb03203e77cd40cdd2d56964ccea25924502020-11-27 4:43:4758 mins ago0xe630b16a6c270708f546086d64bcba69cec1f453 IN  USD Coin: USDC Token0 BNB0.0011363632
0x58f9fd492de3ea371b3dab08b414b413f2f26e8ea2259f2a64bd44106e0a148925924262020-11-27 4:42:3559 mins ago0xb07db6b10915860dadaa3fda65c4e0ba686d77b1 IN  USD Coin: USDC Token0 BNB0.00064304
0xca21ed6887b98b5cc6379bb2d05981b7c4206818087573d7c2d28602031a7e0925924222020-11-27 4:42:2359 mins ago0xc8aff709ce3aaa74ae70bbca0cb76537c7693ac8 IN  USD Coin: USDC Token0 BNB0.00055904
0x42f6b740f2e1577e426510274c0f8da8cc29b2b32d943c6a53aae3ea4fdfcd9f25924212020-11-27 4:42:2059 mins ago0xc338e632a40bbd80fec7ba592182085243239860 IN  USD Coin: USDC Token0 BNB0.00077814
0x2eeb40ce658e0e58f2f5985398166676eae2fd218843062b0cb1369cf50badc625923922020-11-27 4:40:531 hr 1 min ago0xc8aff709ce3aaa74ae70bbca0cb76537c7693ac8 IN  USD Coin: USDC Token0 BNB0.00055904
0x133afd84418aa9b447e6f21c2dc70d46920baee72d9bbcb9546ad01866dd5c4f25923492020-11-27 4:38:441 hr 3 mins ago0xb07db6b10915860dadaa3fda65c4e0ba686d77b1 IN  USD Coin: USDC Token0 BNB0.00094304
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OVERVIEW

USD Coin (known by its ticker USDC) is a stablecoin that is pegged to the U.S. dollar on a 1:1 basis.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xd80045d028c925cf41fdf4074dc65b035dbf5f07c316b9548338e936fa50f9a025936002020-11-27 5:41:1738 secs ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0x2049f3b40cfb6e5d455697e7214c605d7dd1853d10482d9892d2ce127fdea8e825935992020-11-27 5:41:1441 secs ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago 0x516c18dc440f107f12619a6d2cc320622807d0ee USD Coin: USDC Token0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago 0x516c18dc440f107f12619a6d2cc320622807d0ee USD Coin: USDC Token0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xa31bf9518faf5b22c0bb02eeab6bd2c0a8f81e8df3548685eddb4bdb4e8d41e725935892020-11-27 5:40:441 min ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago Venus: vUSDC Token USD Coin: USDC Token0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago USD Coin: USDC Token 0xba5fe23f8a3a24bed3236f05f2fcf35fd0bf0b5c0 BNB
0xc4f31e4f9126a3311a3883370b052bc10a31d1ebd5d987818880c219c0bb75aa25935792020-11-27 5:40:141 min ago 0x516c18dc440f107f12619a6d2cc320622807d0ee USD Coin: USDC Token0 BNB
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xA6Ec2Fe4F6040b188A926048f44c9A59Fca189d4

Contract Name:
BEP20UpgradeableProxy

Compiler Version
v0.6.4+commit.1dca32f3

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Apache-2.0 license
/**
 *Submitted for verification at BscScan.com on 2020-09-29
*/

// File: openzeppelin-solidity/contracts/proxy/Proxy.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

// File: openzeppelin-solidity/contracts/utils/Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: openzeppelin-solidity/contracts/proxy/UpgradeableProxy.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;



/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}

// File: openzeppelin-solidity/contracts/proxy/TransparentUpgradeableProxy.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;


/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 * 
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 * 
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 * 
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 * 
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative inerface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address _admin, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(_admin);
    }

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @dev Returns the current admin.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }

    /**
     * @dev Returns the current implementation.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     * 
     * Emits an {AdminChanged} event.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the implementation of the proxy.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = newImplementation.delegatecall(data);
        require(success);
    }

    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal override virtual {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

// File: contracts/BEP20UpgradeableProxy.sol

pragma solidity ^0.6.0;


contract BEP20UpgradeableProxy is TransparentUpgradeableProxy {

    constructor(address logic, address admin, bytes memory data) TransparentUpgradeableProxy(logic, admin, data) public {

    }

}

Contract ABI

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Deployed ByteCode Sourcemap

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Swarm Source

ipfs://5c518be5ecdac9ebba758e8ce0b8e0dcacae92de07203f44e322e833b133a575
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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